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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: rút gọn giúp mik ạ 2x.(3x+1)+(x+3)(2x-3) (X+1)(x-1)-(x+2)^2

Toán Lớp 8: rút gọn giúp mik ạ
2x.(3x+1)+(x+3)(2x-3)
(X+1)(x-1)-(x+2)^2

Comments ( 2 )

  1. Giải đáp+ Lời giải và giải thích chi tiết:
    2x(3x+1) +(x+3)(2x-3)
    = 6x^2 +2x + 2x^2-3x +6x -9
    = 8x^2 +5x – 9
    (x+1)(x-1) -(x+2)^2
    = x^2 -1 – x^2 – 4x -4
    = -4x -5

  2. 2x(3x+1)+(x+3)(2x-3)
    =6x^2+2x+2x^2-3x+6x-9
    =(6x^2+2x^2)+(2x-3x+6x)-9
    =8x^2+5x-9
    _____________________________________
    (x+1)(x-1)-(x+2)^2
    =x^2-1-x^2-4x-4
    =(x^2-x^2)-4x+(-1-4)
    =-4x-5

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222-9+11+12:2*14+14 = ? ( )